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        <h2 id="mysql主从复制"><a href="#mysql主从复制" class="headerlink" title="mysql主从复制"></a>mysql主从复制</h2><span id="more"></span>

<p><img src="https://cdn.jsdelivr.net/gh/DWJ-Squirtle/blogimage@main/v2_r.jpg"></p>
<p>Mysql的主从复制中主要有三个线程：<code>master（binlog dump thread）、slave（I/O thread 、SQL thread）</code>，Master一条线程和Slave中的两条线程。</p>
<p><code>master（binlog dump thread）</code>主要负责Master库中有数据更新的时候，会按照<code>binlog</code>格式，将更新的事件类型写入到主库的<code>binlog</code>文件中。</p>
<p>并且，Master会创建<code>log dump</code>线程通知Slave主库中存在数据更新，这就是为什么主库的binlog日志一定要开启的原因。</p>
<p><code>I/O thread</code>线程在Slave中创建，该线程用于请求Master，Master会返回binlog的名称以及当前数据更新的位置、binlog文件位置的副本。</p>
<p>然后，将<code>binlog</code>保存在 <strong>「relay log（中继日志）」</strong> 中，中继日志也是记录数据更新的信息。</p>
<p>SQL线程也是在Slave中创建的，当Slave检测到中继日志有更新，就会将更新的内容同步到Slave数据库中，这样就保证了主从的数据的同步。</p>
<h2 id="docker下主从复制实战"><a href="#docker下主从复制实战" class="headerlink" title="docker下主从复制实战"></a>docker下主从复制实战</h2><p><strong>运行主数据库（容器卷）</strong></p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">docker run -p 3307:3306 --name mysql-master \</span><br><span class="line"></span><br><span class="line">-v /mydata/mysql-master/log:/var/log/mysql \</span><br><span class="line"></span><br><span class="line">-v /mydata/mysql-master/data:/var/lib/mysql \</span><br><span class="line"></span><br><span class="line">-v /mydata/mysql-master/conf:/etc/mysql/conf.d \</span><br><span class="line"></span><br><span class="line">-e MYSQL_ROOT_PASSWORD=123456 -d mysql:5.7</span><br></pre></td></tr></table></figure>

<p><strong>mysql创建从客户和授权</strong></p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">mysql&gt;</span><br><span class="line"></span><br><span class="line">CREATE USER &#x27;slave&#x27;@&#x27;%&#x27;IDENTIFIED BY &#x27;123456&#x27;;</span><br><span class="line"></span><br><span class="line">GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO &#x27;slave&#x27;@&#x27;%&#x27;;</span><br></pre></td></tr></table></figure>

<p><a target="_blank" rel="noopener" href="https://www.cnblogs.com/sos-blue/p/6852945.html">MySQL创建用户与授权 - 七月逆流 - 博客园 (cnblogs.com)</a></p>
<p><strong>运行从数据库（容器卷）</strong></p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">docker run -p 3308:3306 --name mysql-slave \ </span><br><span class="line"></span><br><span class="line">-v /mydata/mysql-slave/log:/var/log/mysql \</span><br><span class="line"></span><br><span class="line">-v /mydata/mysql-slave/data:/var/lib/mysql \</span><br><span class="line"></span><br><span class="line">-v /mydata/mysql-slave/conf:/etc/mysql/conf.d \ </span><br><span class="line"></span><br><span class="line">-e MYSQL_ROOT_PASSWORD=123456 -d mysql:5.7</span><br></pre></td></tr></table></figure>



<h4 id="my-cnf配置"><a href="#my-cnf配置" class="headerlink" title="my.cnf配置"></a>my.cnf配置</h4><h5 id="mysql-master"><a href="#mysql-master" class="headerlink" title="mysql-master"></a>mysql-master</h5><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">[mysqld]</span><br><span class="line">server_id=101</span><br><span class="line">binlog-ignore-db=mysql</span><br><span class="line">log-bin=mall-mysql-bin</span><br><span class="line">binlog_cache_size=1M</span><br><span class="line">binlog_format=mixed</span><br><span class="line">expire_logs_days=7</span><br><span class="line">slave_skip_errors=1062</span><br></pre></td></tr></table></figure>



<h5 id="mysql-slave"><a href="#mysql-slave" class="headerlink" title="mysql-slave"></a>mysql-slave</h5><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">[mysqld]</span><br><span class="line">server_id=102</span><br><span class="line">binlog-ignore-db=mysql</span><br><span class="line">log-bin=mall-mysql-slave1-bin</span><br><span class="line">binlog_cache_size=1M</span><br><span class="line">binlog_format=mixed</span><br><span class="line">expire_logs_days=7</span><br><span class="line">slave_skip_errors=1062</span><br><span class="line">relay_log=mall-mysql-relay-bin</span><br><span class="line">log_slave_update=1</span><br><span class="line">read_only=1</span><br></pre></td></tr></table></figure>

<p><strong>配置从数据库主从复制</strong></p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">change master to master_host=&#x27;192.168.196.130&#x27;,master_user=&#x27;slave&#x27;,master_password=&#x27;123456&#x27;,master_port=3307,master_log_file=&#x27;mall-mysql-bin.000001&#x27;,master_log_pos=617,master_connect_retry=30;</span><br></pre></td></tr></table></figure>



<h4 id="restart失败"><a href="#restart失败" class="headerlink" title="restart失败"></a>restart失败</h4><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">docker start -i (name)  #查找错误原因</span><br></pre></td></tr></table></figure>

<p><strong>在主数据库中查看同步状态</strong></p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">show master status;#(横着的)</span><br></pre></td></tr></table></figure>

<p><strong>在从数据库中查看同步状态</strong></p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">show slave status \G;#(竖着的)</span><br></pre></td></tr></table></figure>

<p><strong>在从数据库中开启主从同步</strong></p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">start slave</span><br></pre></td></tr></table></figure>


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